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Overview of MCWF Interfaces. The interface configuration is nearing finalization. C-C inner legs are electrically insulated & left to slide ( motion ~0.5 mm). 1 of 3 identical field periods. 5 welds/period (typ.) in central region. Alumina Coated SS Shim Friction Characteristics. - PowerPoint PPT Presentation
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Overview of MCWF Interfaces
The interface configuration is nearing finalization.
5 welds/period (typ.) in central region.
1 of 3 identical field periods
C-C inner legs are electrically insulated & left to slide ( motion ~0.5 mm).
Alumina Coated SS Shim Friction
Characteristics
y = 0.0005x + 0.6733
R2 = 0.0006
y = 0.0169x + 0.3948
R2 = 0.2093
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0 2 4 6 8 10 12 14 16 18 20
Contact pressure (ksi)
Ap
pa
ren
t m
u With Binder
No Binder
Linear (With Binder)
Linear (No Binder)
Mu needed on inner legs to prevent inner leg slip is too high
Coefficent of Friction Needed to Prevent IL SlipCombined Coil Model (Mod/TF/PF)
Inboard Regions With and Without Added Bolts - Dead Load+EM+CD
0.000
0.100
0.200
0.300
0.400
0.500
0.600
0.700
0.800
cc2i
nt
cc2i
nb
bc2i
nt
bc2i
nb
ab2i
nt
ab2i
nb
aain
t
aain
b
abin
t
abin
b
bcin
t
bcin
b
ccin
t
ccin
b
Joint-Location
mu
These IL’s will be welded to address high mu requirement.
Mu with 2/3 criteria factor applied
Mu based on data
C-C will be insulated and left to slide
With No Slip on inner legs, friction required on the outer legs to prevent them slipping is well within the friction capabilities of the alumina coated shims with excellent
factors of safety.
Coefficent of Friction Needed to Prevent SlipCombined Coil Model (Mod/TF/PF)
Outboard Regions Dead Load+EM+CD
0.000
0.050
0.100
0.150
0.200
cc2b
cc2t
bc2b
l
bc2b
rl
bc2b
ru
bc2t
rl
bc2t
ru
bc2t
l
ab2b
l
ab2b
r
ab2t
rl
ab2t
ru
ab2t
l
aabl
aabr
aatr
aatl
abbl
abbr
l
abbr
u
abtr
abtl
bcbl
bcbr
l
bcbr
u
bctr
l
bctr
u
bctl
ccb
cct
Joint-Location
mu
Highest is ~0.16 vs. measured value of >0.6
Friction = 0.04 on Inner-leg region, mu = 0.4 everywhere else
No Inboard Bolt Friction
Frictionless In board leg
Peak Shear is 4.8 Kips
Sliding is 19 mils
0.00220.00440.00660.00880.01100.01330.01550.01770.0199
InchesBolt 32
Bolt 1
C-C Bolt Preload & EM-Driven Bolt Shear Load with no in board bolts or friction with perfect fitup
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Bolt #
Te
ns
ion
, k-l
b
0
2
4
6
Sh
ea
r L
oa
d, k
ip
Tension no pucks (Pre), kip
Shear with mu = .4 everywhere (Pre+EM-Pre), Kip
Shear with mu = .04 on unbolted regions (Pre+EM-Pre), kip
Definition of shim segments
cc2t
cc2b
cct
cc2int
ccb
ccint
bc2tlbc2tru
bc2trl
bc2bru
bc2int
bc2brlbc2bl
bcint
bctlbctru
bctrl
bctrl
bcbrlbcbl
aaint
aatl
aabl
aatr
aabr
ab2int
ab2tl ab2tru
ab2trl
ab2br
ab2bl
abint
abtl
abtr
abbru
abbrlabbl
-60 deg
+60 deg
0 deg
cc2inbbc2inb
ab2inb aainb
ccinbbcinb
abinb
Our plan: weld the inner legs of all but C-C
A-A
• Configuration: weld all intra-period interfaces and maintain a bolted / insulated interface between the field periods.
•This addresses the inter-period friction & deflection requirements and bolt stress very nicely.
• This is also very compatible with machine assembly procedures.
C-C Slide Concept
• Slide plates located top & bottom and along mid-section.
• Plate thicknesses determined by metrology measurements.
• Slide plates will be restrained to react friction loads with adequate F.S.
• 3 additional bolts & friction shims will be added top and bottom to address bolt loading issue.
Bolts can be added on the C-C interface if necessary
Can also access bolts from the side